package com.coderman.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Created by ${fanchunshuai} on 2017-6-29.
 *
 * @version: V1.0
 * @Desc:
 * @Copyright (c) 2017 58到家-版权所有
 */
public class MD5Utils {

    /**
     * 加密方法
     * @param inStr
     * @return
     */
    public static String string2MD5(String inStr){
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        char [] charArray = inStr.toCharArray();
        byte [] byteArray = new byte[charArray.length];

        for (int i = 0;i < charArray.length;i ++){
            byteArray[i] = (byte)charArray[i];
        }

        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i =0;i < md5Bytes.length;i ++){
            int val = ((int)md5Bytes[i]) & 0xff;
            if(val < 16){
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));
        }

        return hexValue.toString();
    }

    /**
     * 解密方法
     * @param inStr
     * @return
     */
    public static String convertMD5(String inStr){
        char []  a = inStr.toCharArray();
        for (int i = 0;i < a.length;i++){
            a[i] = (char)(a[i] ^ 't');
        }
        String string = new String(a);
        return string;
    }

    public static void main(String[] args) {
        String s = new String("localhost");
        System.out.println("原始："+s);
        System.out.println("MD5后:"+string2MD5(s));
        System.out.println("加密后："+convertMD5(s));
        System.out.println("解密后："+convertMD5(convertMD5(s)));
    }
}
